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Finding the Fourth Proportional to 1,380,796.12, 1,905,042 and 807,430.42

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Solution

The fourth proportional to 1,380,796.12, 1,905,042 and 807,430.42 is: 1,113,986.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380,796.12 : 1,905,042 = 807,430.42 : x
  2. Step 2: Convert to fraction form
    1,380,796.12/1,905,042 = 807,430.42/x
  3. Step 3: Cross multiply
    1,380,796.12x = 1,905,042 × 807,430.42
  4. Step 4: Simplify right side
    1,380,796.12x = 1,538,188,862,177.64
  5. Step 5: Solve for x
    x = 1,538,188,862,177.64/1,380,796.12
  6. Step 6: Final answer
    x = 1,113,986.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.